Sylvatac RE | IMCD US
SYLVATAC RE 25 is recommended as an adhesive tackifier where the good wetting performance is required. Recommended uses include packaging, bookbinding, disposable, pressure sensitive and other adhesive applications as well as sealants, coatings and wax-based products.
Selecting Tackifiers for Adhesives and Sealants
Hydrocarbon resin tackifiers are manufactured from petroleum-based feedstock, and therefore, they have the disadvantage of being linked to the price of oil. These resins have a somewhat lower compatibility range with base polymers than tackifiers produced from natural feedstock.
Dibenzoate Plasticizers in Waterborne Acrylic PSAs
The highest value by this test is at the maximum of plasticizer and tackifier. The next parameter is probe tack, which is yet another way to evaluate the tack of a PSA. Figure 6 shows this data. The addition of the plasticizer significantly increases the probe tack of the PSA evaluated. The 180° peel data are illustrated in Figure 7.
5 Most Important Additives for Waterborne Adhesives
Plasticizer, Defoamer, or Rheology modifiers. The selection of the ingredients and their concentrations for any waterborne formulations will depend on the end-properties required, the application and processing requirements, and the overall cost target of the adhesive.
Plastic Additives
Plasticizers improve the flexibility and durability of plastics. They are used in a number of plastics. However, almost 90% of all plasticizers are used for the production of flexible PVC. Plasticizers are essentially non-volatile solvents. The most common plasticizers are phthalatic, trimellitic, benzoic, and adipic acid esters.
- What are Tackifiers & plasticizers in PSAs?
- Source: Extance, A., “Using Tackifiers and Plasticizers in PSAs”, SpecialChem, February 9, 2009. Plasticizers are organic liquids or solids that are incorporated by melt processing or diffusion into a compatible polymer to reduce interaction between molecules and improve molecular mobility.
- Does tackifier increase Tg?
- Therefore, the tackifier addition raises the Tg of the final adhesive. Tackifiers operate opposite to plasticizers which lower the Tg of the adhesive formulation. The tackifying agent must be compatible with the base polymer. With hot-melt adhesives, consideration must also be given to the heat stability of the tackifier in the melt.
- What are Tackifiers used for?
- In adhesive and sealant formulations, tackifiers are used to generate tack and improve specific adhesion (peel strength). They are incorporated into base polymers which mainly lack tackiness and pressure-sensitive properties but provide cohesion.
- Does a tackifier reduce the modulus of a polymer?
- Because tackifiers have lower molecular weight than the base polymer, they dilute the polymeric network and reduce the modulus. A plasticizer by itself could also reduce the modulus, but this is generally an ineffective approach because the Tg of the entire formulation is significantly reduced.
- How do I choose a tackifier for a hot-melt adhesive?
- With hot-melt adhesives, consideration must also be given to the heat stability of the tackifier in the melt. Tackifiers with unsaturation could potentially gel while the adhesive is in the melt phase. They should also have a relatively low surface tension so as to readily wet the substrate.
- Can a tackifier be used in a polystyrene block copolymer?
- The tackifier can be directed to either or both phases depending on its compatibility. For example, in styrene block copolymers the formulator may want the polystyrene phase to remain glassy for optimum cohesive properties. The aliphatic C5 resins, which are more compatible in the non-styrene phase, therefore are more likely to be used.
